Apparatus for forming die castings



L. H. MORIN 2,263,899

7 APPARATUS FOR FORMING DIE CASTINGS Nov. 25, 1941.

Filed July 10, 1940 INVENTOR fla lav/6 Mom/v 'ATTQRNE S Patented Nov. 2b, 1941 APPARATUS FOR romumo on: casrmos Louis H. Morin, Bronx, N. Y., assignor to Whitehall-Patents Corporation, Bronx, N. Y., a cor- I poration of New York A pplication July 1o, maseria mo. 344,656 10 Claims. (o1. 22-92) This invention rel-ates to the formation of die castings, such for example as the slider of a separable fastener. More particularly the invention relates to'an apparatus for forming what may be termed undercut portions in a casting by employing one die member composed of two parts or sections, one movable relatively to the other in forming the undercut and in releasing said section from the casting in order to remove the casting from the dies, such castings having undercut portions being formed in accordance with themethod as hereinafter set forth. The novel features of the invention will be best understood from the following description and annexed drawing in which certain embodiments of the invention are disclosed and in which the separate parts ployed on the stringers of separable fasteners. In Figs. and 6 or the-drawing, two difl'erent forms of sliders are shown, whereas the die structure as seen in Figs. 1 to 4 inclusive is applicable to the formation of the slider casting l0 shown in V Fig. 5. This die structure would naturally be modified slightly in forming a die castslider such are designated by suitable reference characters in each of the views and in which:

Fig. 1 is a plan and sectional view of a part of a casting machine showing the die structure employed.

Fig. 2 is a face view of the structure as seen in .Fig. 1 with part of the construction brokenaway and in section.

Fig. 3 is a view similar to Fig. 1 showing the parts in a difierent position.

Fig. 4 is a view similar to Figs. 1 and 3 showing the parts in still another position.

Fig. 5 is a detail view of a product made in accordance with the teachingsin Figs. 1 to 4 inof my present invention to provide a s'imple,'practical, as well as automatic means for forming undercut portions in die castings by employing a novel die construction wherein one of the die members is divided into independent sections or die parts relatively movable to each other in the automatic withdrawal of the undercut forming element of the die part, prior to the separation of the dies and removal of the casting from the impression or mold cavity. r

In illustrating one adaptation of the invention, it hasbeen shown as applied to the formation of In Fig. 6, the slider body Ila has on the outer I surface of one wall thereof an elongated loop I2a in which is formed an elongated transverse aperture l3a. The apertures or openings I3, |3a constitute the undercut portions of the die castings which are to be formed in accordance with the method and apparatus as now described.

In Figs. 1 to 4 inclusive is shown the novel die structure as applied to die casting machines or the general type and kind as disclosed in my prior Patent No. 1,975,966 dated October 9, 1934. At

15 is shown one of the two reciprocating die operq ating rods employed in machines of this type and kind which moves transversely across the longitudinal plane of the dies in moving the dies to ward and from each other. The rods I 5 can, tooth-like angularly disposed cam section's l6 which move the two die members generally, indicated at l1 and |8, toward and from each other. The rod actuating the die member I8 is omitted as this structure is consistent with the conventional structure and forms no special part of the present invention. The die members I! and I8 when brought together form one impression or cavity IS on the parting line Illa of said die members, of such contour as'to form the slider l0 shown in Fig. 5. Upper and lower cores 20 and 2| are employed to form the channel of the slider body ll including the connecting web 22.between the spaced walls of the body, note Fig. 5 of the drawing. The cores 20 and 2| are of the general structure dis-- closed in Patent No. 2,181,142 of November 28, 1-939, and therefore no specific illustration or description of these cores is necessary in this case. Bothof these cores are arranged on the parting line l9 a or the dies and the cores are used to undercut portions in die cast sliders, such as em- 'strip the castings from the die members l1 and I path of the lug l2 in the manner clearly illuswhich is closed at its outer end by a plate 3-1.

the die part i1 is provided with a transverse rewith. the cam sections IS in all positions of the .direction of the arrow :0, Fig. 1 -will cause the die part 21 to rotate on its pivot l8when separated. In separating the cores 20 and.2|,the casting can be stripped from one of these cores, preferably the core 20. The cores 20 and 2| form the side openings 23 between the walls of the slider as noted in Fig.5 of the drawing, and with the present construction, the cast ing material is injected into the cavity l9 formed by the die members l1 and I8 when'held'in engagement with each other, from a nozzle 24 through :a gate passage 25 arranged on the parting line 19a of the dies and opening into one side of the cavity substantially centrally thereof. It will be understood that themetal or other casting material flows to both parts of the impres from the die. l8, also has a swinging movement on a pivot 28, sb-that a core portion 29 on the part '21, used for forming the recess or aperture 13 inthe casting Hi, can be moved out of the trated in Fig, 3 of the drawing, to permit separation of thedies l1 and I8, as will be apparent. 1

The parts 26 and 21 .are slidably mounted in a suitable slideway, 30 provided on the machine The plate is secured in position by screws as indicated at 32 in Fig. 2 of the drawing, suitable key or alinement pins 33'being employed. Tw'o set screws 34 and 35 are employed, one for accurately guiding'th'e die part 26 and the other for engaging a bearing plate 36 arranged-adiacent the pivot portion of the part 21. At the outer end of the die part 26 is a projecting lug which are indicated in Fig. 3, the engagement'of said cavity.

intothe cavity toiorm acastlng such as III in In the next operation of the machine the :bars

or rodsl move in the direction of the arrow :02

of Fig. 3, and in the first stages of this operation.

the cam sections W with the die part 21 will first cause this die part. to swing on its pivot 28 to withdraw the core element 29 in the manner shown in said figure, and also to move the plate 43 at the outer end of the die part 21 out of the.notch 39a of the heel 39. As the movecasting. After this, the casting is stripped from 1 the core parts, as previouslydescribed.

The last named position of the parts is shown in Fig. 4 of the drawing, in whichfigure' it will appear that the outerend of the die part 21 or the plate portion 43 thereof has beenmoved onto the inner-surface 39b of the heel plate 38, thus maintaining the die parts 26 and 21 in their open position.

In completing the cycle of operation, or in other I words again moving the die parts 26, 21 into the closed position shown in Fig. 1, it will appear that both die parts 26, 21 are first moved 'in the d1! 31-supporting a stop screw 38 .for limiting the closing movement of the die part 26 to regulate proper setting of the dies 11 and I8 one with respect to the other.- a At 39 is shown a heel plate adjusted in the plate 3I'through a screw and'retained in dif-' ferent positions of adjustment'by screws 4|. The plate 39 has a notch 39a which cooperates with the outer end 42 of the die part 21 or a facing plate 43 of hard material mounted insaid end 42, a's clearly illustrated. Adjacent the end 4-2.

cess 44 of preferably rounded contour, clearly illustrated in the drawing and. .having suillcientj clearance with respectto the cam sections l6 as ,to compensate for the slight swinging movement of the die part 21. It will be understood that the recess 44'opensthrough' the outer surface of the die part 21 as does also an elongated recess 45 motion of the die I8. At the completion of this movement, the diepart 21 is swung on its axis 28. to bring the two parts 26, 21 in firm engagement with each other at the inner cavity end of said die part, or in other words, in the-position shown in Fig. 1 of the drawing.

- The die parts 26, 21 may bereferred to as tonglike parts in the relative pivotal movement of said parts. In the construction shown, however, only one of the tong members, namely'the die part 21, is movable. a very simple and yet effective means for supporting an undercutcore element in the cavity of a die and for automatically displacing this element'from the cavity after the casting has been formed and before separation of the two dies which collectively form the cavity. It will of course be apparent that while'the invention has been shown as applied to the forma-' 'tion of certain types and kinds of castings, that types of castings which are formed; Fig. 6 being formed in thedie part 26; the latter having sufficie'nt clearance to avoid contacting engagement and at, the same time will move both die parts 1 26 -and 21 into the position shown in Fig. 1, thus.

"forming a mold or die cavity. I-nthis-position of the parts, .the plate 43 isin the notch sea of the'heel 39*, and the core element 29 extends into. that part of the cavity from which the -.res'ultin'g lug-l2 is formed from the'casting l0. With the parts firmly held in thisposition,'the

casting material is injected through the nozzle illustrative of one other possible form of core element which would be required, that is to say, .anelement of general contour of the elongated aperture l3a, *In all castings, however, it is preferred that a slight taper be provided .onthese core elements to permit free withdrawal thereof. particularly bearing in mind the fact that the element is swung on a pivoted member in a relatively large radius arc. Furthermore, the slight taper, is desirable in any event for tree removal of the element. In the' present illustration the taper is somewhat exaggerated in' order to'clear- 4 'to car for the automatic independent operation l of one part of the die tomovethe core element This construction provides into the open position as well as placingthe core element in the closed or operative position.

Having fully described my invention, what I claim as new and desire to secure by Letters Patcut, is:

1. In die casting machines, two relatively movable dies collectively forming a mold cavity on adjacent abutting surfaces of the dies when held in firm engagement with each other, at least one of said dies being composed of separate parts, means pivoting and keying said parts to provide swinging movement of the cavity end of one part relatively to the other part, the core element on thecavity end of said movable part extending into the cavity of said dies in forming an undercut recess in the resulting casting, means for moving both dies toward and from each other, and the means for actuating the die comprisin the separate parts being in direct operative engagement with said movable part to first move said part into open position in advance of moving both parts collectively into open position to free said core element from the casting and in liberating the casting from the impression of both dies..

2. In die casting machines, two relatively moviustable means checking the movement of both die parts in the direction of the otherdie.

4. The die structure forcasting machines ofdies movable toward and from each other with a cavity formed between adjacent abutting surfaces of said dies, one of saiddies comprising elongated rod parts, means pivotally coupling said parts intermediate their ends and to key the parts against relative longitudinal movement, means guiding both of said parts for collective sliding movement toward and from the other die, means in operative engagement with one end of one of said parts to swing said part on its pivot to move the other cavity and of the part substantially parallel to the'parting line at adjacent abutting surfaces of said dies, and said last named cavity end of said swingable die part having a core element extending into the die cavity and movable'free of the resulting casting formed in the die cavity to provide separation of said dies.

5. The die structure for casting machines of .the class described, said structure comprisingable dies collectively forming a-mold cavityon moving both dies toward and from each other,

the means for actuating the die comprising the separate parts being in direct operative engagement with said movable part to first move said part into open position in advance of moving both p'arts collectively into open position to free said core element from the casting and in liberdies movable toward and from each other with'a cavity formed between adjacent abutting "sursliding movement toward and from the other die, means in operative engagement with one end of one of said parts to swing said part on its pivot to move the other cavity end of the part substantially parallel to the parting line at adjacent abutting surfaces of said dies, said last named cavityend of said swingable die part having a core element extending into the die cavity and" ating the casting from the impression of both dies, means supporting-and maintaining the movable die part inopen position in initially moving both die parts into closed position with respect to the other die and thereafter automatically moving the movable die part into closed position.

3. In die casting machines, two relatively movable dies collectively forming a mold cavity on adjacent abutting surfaces of the dies when held in firm engagement with each other, at least one of said dies being composed of separate parts, means pivoting and keying said parts to provide swinging movement of the cavity end of one part relatively to the other part, the core element on,

the cavity" end of said movable part extending into the cavity of said dies in forming an under-- cut recess in the resulting casting, means for moving both dies toward and from each other, the

means for actuating the die comprising the separate parts being in direct operative engagement with said movable part to first move said part into open position in advance of moving both' the movable die part into closed position, and admovable free of the resulting casting formed in the die cavity to provide separation of said dies, a notched heel plate adjustably engaging the first named end of said swingable diepar-t to insure initial swinging movement of said part in advance of sliding movement 'of both die 'parts in the separation of the dies.

6. The die structure for casting machines of the class described, saidstructure comprising dies movable toward and from each other with a cavity formed between adjacent abutting surfaces of said dies, one of said dies comprising elongated rod parts, means pivotally coupling said parts intermediatetheir ends and to key the parts against relative longitudinal movement,

means guiding both of said parts for collective sliding movement toward and from the other die, means in operative engagement with one end of one of said parts to swing said part on its pivot to move the other cavity end of the part having a core element extending into th die cavity and movable free of the resulting casting formed in the die cavity to provide separation of said dies, a notched heel plate adjustably engaging the first named'end of said swingable die part to'insure initial swinging movement of said part in advance of sliding movement of both die parts in the separation of the dies, and said heel plate supporting the *swingable die part in open position while both dies are in spaced relation to each other.

7. In die casting structure having complemen ry parts relatively movable into closed 4 v and open position and adapted when in closed position to form a mold cavity, one of said parts being composed of a first portion and a second core-carrying portion, the core-carrying portion carrying a core element extending into the mold cavity to form an undercut recess in'the casting,

the core-carrying portion being mounted on and joined to the first portion and adapted to have a first movement collectively with and in the same direction as the movement of said first portion, and a second movement substantially at right angles to said direction; means engaging said core-carrying portion to effect, both movements; and means to restrict the movement of the core-carrying portion to its second movement until the said core is released from thecasting.

into' open position; the core-carrying portion being pivotally mounted on" and joined to the first portion and adapted to have a first .move- 2 ment collectively with and in the same direction as the movement of said first portion, and a second pivotal movement substantiallyat right angles to said direction; and means to eflect I said second pivotal movement prior to the first movement to release said core from the casting prior to collective movement of said portions into open position.

9. In die casting structure having comple-' mentary partsrelatively. movable into closed and open position and adapted when in closed position to form a mold cavity, one of said parts.

' being composed of a first portion and asecond core-carrying portion, both of said portions being mounted for slideable movement on a slideway;

the core-carrying portion comprising a lever pivotally joined to the first portion and adapted to have a first movement of translation collectively with and in the same direction as the movement of said first portion; and -a second movement of rotation substantially at right angles to said direction, said lever carrying at one end a core element extending into the 'mold cavity to Iorm'an undercut recess in the casting; v

means engaging. the other end of said 'lever to effect both movements; and means on said 'slide-' way to restrict the movement oi the lever arm to its second movement until the said core isv released from the casting.

v 10. In die casting structure having comple+ mentary parts relatively movable into closed and open position and adapted when in closed position to form a mold cavity,'one of said parts being composed of a first portion and, a second core-carrying portion; the core-carrying portion being slideably mounted, for translator'y move-- ment; on a slideway and'being pivotally mounted, l intermediate the ends thereof, on and joined to the-first portion and adapted to have afirst movement of translation collectively with and in the samedirection as the'movement -of said first portion, and a second movement of rotation substantially at right angles to .said direction, the core-carrying portion carrying at one end thereof a core element extending intothe mold cavity to form an undercut recess in the casting; means engaging said core -carrying portion to efi'ec't both movements; and means on the I slideway to engage the core-carrying portion and to restrict the-movement thereof to its second movement until'the said core is released from the casting. j

LOUIS H. MORIN. 

